JP2006194432A - Piping member for transporting fuel - Google Patents

Piping member for transporting fuel Download PDF

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Publication number
JP2006194432A
JP2006194432A JP2005342038A JP2005342038A JP2006194432A JP 2006194432 A JP2006194432 A JP 2006194432A JP 2005342038 A JP2005342038 A JP 2005342038A JP 2005342038 A JP2005342038 A JP 2005342038A JP 2006194432 A JP2006194432 A JP 2006194432A
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Japan
Prior art keywords
fuel
connector
retainer
resin tube
mating pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2005342038A
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Japanese (ja)
Inventor
Tomoki Inoue
知己 井上
Masayuki Sasagawa
雅之 笹川
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Sumitomo Riko Co Ltd
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Sumitomo Riko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Riko Co Ltd filed Critical Sumitomo Riko Co Ltd
Priority to JP2005342038A priority Critical patent/JP2006194432A/en
Priority to US11/304,386 priority patent/US20060134360A1/en
Publication of JP2006194432A publication Critical patent/JP2006194432A/en
Priority to US12/325,605 priority patent/US8534711B2/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/16—Layered products comprising a layer of natural or synthetic rubber comprising polydienes homopolymers or poly-halodienes homopolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
    • F16L3/12—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing comprising a member substantially surrounding the pipe, cable or protective tubing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
    • F16L3/12—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing comprising a member substantially surrounding the pipe, cable or protective tubing
    • F16L3/127—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing comprising a member substantially surrounding the pipe, cable or protective tubing and extending away from the attachment surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/30—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses comprising parts inside the hoses only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
    • F16L37/0985—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks the flexible hook extending radially inwardly from an outer part and engaging a bead, recess or the like on an inner part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2274/00—Thermoplastic elastomer material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L11/00—Hoses, i.e. flexible pipes
    • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
    • F16L2011/047—Hoses, i.e. flexible pipes made of rubber or flexible plastics with a diffusion barrier layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2201/00—Special arrangements for pipe couplings
    • F16L2201/10—Indicators for correct coupling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/9029—With coupling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
    • Y10T428/1393—Multilayer [continuous layer]

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)
  • Pipe Accessories (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping member easily connectable to a mating pipe without requiring caulking of fittings for connection with the mating pipe when assembling to a vehicle body, and provided with a resin tube hardly broken even when bending force is applied, as a main element. <P>SOLUTION: The piping member 13 for transporting fuel is constructed by combining the resin tube 14 and a connector 16 for connection with the mating pipe. The connector 16 has a connector body including a retainer holding part, a retainer engaged with the mating pipe and fixing it axially, and an O-ring air-tightly contacting the outer peripheral face of the mating pipe. The resin tube 14 is a thin-diameter tube having a laminated structure including an inner ETFE layer 14A as a fuel barrier layer and an outer PA layer 14B with an outer diameter less than 6 mm. A ratio d<SB>2</SB>/t of the outer diameter d<SB>2</SB>of the tube 14 to the thickness t is set in a range of 4 to 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明はエンジンと燃料タンクとの間に配管されて燃料輸送を行う燃料輸送用の配管部材に関する。   The present invention relates to a piping member for fuel transportation that is piped between an engine and a fuel tank and transports fuel.

近年、排出ガス規制が強まるのに伴い排気量の小さい軽自動車や自動２輪車，自動３輪車，ＡＴＶ（All Terrain Vehicle）等の小型車両においても燃料効率の高い燃料噴射方式（インジェクション方式）が用いられるようになって来ている。   In recent years, as fuel emission regulations have become stronger, fuel injection systems with high fuel efficiency (injection systems) can be applied to small vehicles such as mini cars, motorcycles, motorbikes and ATVs (All Terrain Vehicles). Has come to be used.

この燃料噴射方式は、予め燃料に圧力を加えておき、インジェクタ（燃料噴射ノズル）の弁を開いている間だけ燃料を噴射する方式で、燃料輸送用配管には０．２５〜０．３５ＭＰａの耐圧性を持たせる必要がある。
そのため配管用としてゴムホースを用いる場合には、その端部に金具をかしめ付けて相手パイプと接続することが必要であり、この場合手間がかかる上コスト高となる問題がある。
またゴムホースの場合には外径が太くなり、限られた狭い配管スペースにおいて機器の間の隙間をぬって配管の取りまわしを行う際の制約が大きくなるといった問題も生ずる。 This fuel injection system is a system in which pressure is applied to the fuel in advance and the fuel is injected only while the injector (fuel injection nozzle) valve is open. The fuel transport pipe has a pressure of 0.25 to 0.35 MPa. It is necessary to have pressure resistance.
For this reason, when a rubber hose is used for piping, it is necessary to connect a metal fitting to the end of the rubber hose and connect it to the mating pipe. In this case, there is a problem that it takes time and costs.
Further, in the case of a rubber hose, the outer diameter becomes large, and there arises a problem that the restriction when the pipes are routed through a gap between devices in a limited narrow pipe space is increased.

一方、燃料輸送用として樹脂チューブを用いることも従来行われている。
配管用としてかかる樹脂チューブを用いる場合、簡単且つ迅速に相手パイプと接続を行うことのできるコネクタ（クイックコネクタ）と組み合わせて用いることが行われている。
この場合、配管用としてゴムホースを用いる場合のようにゴムホース端部に金具をかしめ付けて相手パイプと接続するといったことを不要となすことができる。
この種コネクタについては、例えば下記特許文献１に開示が成されている。
図１１，図１２はその一例を示している。 On the other hand, the use of a resin tube for transporting fuel is also conventionally performed.
When such a resin tube is used for piping, it is used in combination with a connector (quick connector) that can be easily and quickly connected to a mating pipe.
In this case, it is possible to eliminate the need for caulking a metal fitting to the end of the rubber hose and connecting it to the other pipe as in the case of using a rubber hose for piping.
This type of connector is disclosed, for example, in Patent Document 1 below.
11 and 12 show an example thereof.

これらの図において２００は樹脂チューブであり、２０２はその樹脂チューブ２００を接続すべき相手パイプである。
相手パイプ２０２には、その外周面に環状に突出する係合凸部（パイプ側係合部）２０４が形成されている。
２０６はコネクタで、コネクタ本体（ここでは全体が樹脂製）２０８と、リテーナ２１０及びシール部材としてのＯリング２１２，ブッシュ２１４とを有している。
コネクタ本体２０８は、軸方向の一方の側にリテーナ保持部２１６を有しており、また他方の側に樹脂チューブ２００との接続部としての圧入部２１８を有している。 In these figures, 200 is a resin tube, and 202 is a mating pipe to which the resin tube 200 is to be connected.
The mating pipe 202 is formed with an engaging convex portion (pipe side engaging portion) 204 projecting annularly on the outer peripheral surface thereof.
Reference numeral 206 denotes a connector, which includes a connector main body (here, entirely made of resin) 208, a retainer 210, an O-ring 212 as a seal member, and a bush 214.
The connector main body 208 has a retainer holding portion 216 on one side in the axial direction, and a press-fit portion 218 as a connection portion with the resin tube 200 on the other side.

圧入部２１８は、樹脂チューブ２００の内部に軸方向に圧入される部分であって、その外周面に且つ軸方向の異なった複数箇所に、断面が鋸歯状の先端が鋭角をなす環状突起２２０が形成されている。
コネクタ本体２０８は、この圧入部２１８を樹脂チューブ２００内部に圧入することによって、かかる樹脂チューブ２００と接続される。 The press-fitting portion 218 is a portion that is press-fitted in the axial direction into the resin tube 200, and an annular protrusion 220 having a sawtooth-shaped tip and an acute angle is formed at a plurality of locations on the outer peripheral surface and different in the axial direction. Is formed.
The connector main body 208 is connected to the resin tube 200 by press-fitting the press-fitting portion 218 into the resin tube 200.

このとき、圧入部２１８の外周面に形成された環状突起２２０が、圧入により膨出変形した樹脂チューブ２００の端部内面に食い込んで樹脂チューブ２００を抜止めする。
尚、圧入部２１８には環状溝が形成されていて、そこにＯリング２２２が保持されており、このＯリング２２２によって圧入部２１８と樹脂チューブ２００との間が気密にシールされる。 At this time, the annular protrusion 220 formed on the outer peripheral surface of the press-fitting portion 218 bites into the inner surface of the end portion of the resin tube 200 bulging and deformed by press-fitting to prevent the resin tube 200 from being pulled out.
Note that an annular groove is formed in the press-fit portion 218, and an O-ring 222 is held therein, and the space between the press-fit portion 218 and the resin tube 200 is hermetically sealed by the O-ring 222.

上記リテーナ保持部２１６は、リテーナ２１０を内部に収容状態で保持する部分で、コネクタ本体２０８はこのリテーナ２１０を介して相手パイプ２０２と接続される。
このリテーナ保持部２１６には、その前端にリテーナ２１０との掛止用の掛止部（本体側掛止部）２２４が設けられている。
一方リテーナ２１０は、全体として略環状をなす樹脂製の部材であって径方向に弾性変形可能となしてある。 The retainer holding portion 216 is a portion that holds the retainer 210 in an accommodated state, and the connector main body 208 is connected to the mating pipe 202 via the retainer 210.
The retainer holding portion 216 is provided with a latching portion (main body side latching portion) 224 for latching with the retainer 210 at the front end thereof.
On the other hand, the retainer 210 is a resin member having a substantially annular shape as a whole, and is elastically deformable in the radial direction.

このリテーナ２１０には、相手パイプ２０２の係合凸部２０４を径方向内方から係合させる係合凹部又は係合スリット部（リテーナ側係合部）２２５と、コネクタ本体２０８側の上記掛止部２２４に対し、同じく径方向内方から嵌り合って軸方向に掛止する掛止溝（リテーナ側掛止部）２２６とが設けられている。
リテーナ２１０は、この掛止溝２２６をリテーナ保持部２１６の掛止部２２４に掛止させることで、かかるリテーナ保持部２１６により軸方向に固定状態に保持される。 The retainer 210 includes an engagement recess or engagement slit portion (retainer side engagement portion) 225 that engages the engagement projection portion 204 of the mating pipe 202 from the inside in the radial direction, and the above-described latching on the connector main body 208 side. A latching groove (retainer side latching portion) 226 that fits radially inward from the portion 224 and latches in the axial direction is provided.
The retainer 210 is held in a fixed state in the axial direction by the retainer holding portion 216 by hooking the hook groove 226 on the hook portion 224 of the retainer holding portion 216.

このリテーナ２１０にはまた、内周面と外周面とにテーパ形状の内周カム面２２８と外周カム面２３０とが形成されている。
内周カム面２２８は、相手パイプ２０２をリテーナ２１０内部に軸方向に挿入したとき、係合凸部２０４と当接してその移動案内をなすとともに、係合凸部２０４の移動に伴ってリテーナ２１０をカム作用で全体的に且つ弾性的に拡開運動させ、係合凸部２０４の通過を許容する。
そして係合凸部２０４が係合凹部２２５の位置に到ったところでリテーナ２１０が全体的に元の形状に復形し、これと同時に係合凸部２０４が係合凹部２２５に嵌り合って、それらが軸方向に互いに固定状態となる。 The retainer 210 also has an inner peripheral cam surface 228 and an outer peripheral cam surface 230 that are tapered on the inner peripheral surface and the outer peripheral surface.
When the mating pipe 202 is inserted into the retainer 210 in the axial direction, the inner circumferential cam surface 228 abuts against the engaging convex portion 204 to guide its movement, and the retainer 210 moves along with the movement of the engaging convex portion 204. Is expanded by the cam action as a whole and elastically, and the engagement convex portion 204 is allowed to pass.
Then, when the engaging convex portion 204 reaches the position of the engaging concave portion 225, the retainer 210 is entirely restored to the original shape, and at the same time, the engaging convex portion 204 is fitted into the engaging concave portion 225, They are fixed to each other in the axial direction.

他方外周カム面２３０は、リテーナ２１０をコネクタ本体２０８のリテーナ保持部２１６に軸方向に挿入する際、掛止部２２４との当接によってリテーナ２１０を全体的に且つ弾性的に縮径運動させ、その縮径運動を伴って掛止溝２２６を掛止部２２４に対し掛止させる。
尚リテーナ２１０の先端部には操作つまみ２３１が設けられており、この操作つまみ２３１に力を加えることによって、リテーナ２１０を縮径運動させることもできる。 On the other hand, the outer peripheral cam surface 230 causes the retainer 210 to reduce the diameter of the retainer 210 as a whole and elastically by contact with the latching portion 224 when the retainer 210 is inserted into the retainer holding portion 216 of the connector body 208 in the axial direction. The latching groove 226 is latched to the latching portion 224 with the diameter reduction motion.
An operation knob 231 is provided at the tip of the retainer 210. By applying a force to the operation knob 231, the retainer 210 can be reduced in diameter.

このコネクタ２０６では、リテーナ２１０をコネクタ本体２０８のリテーナ保持部２１６に保持させておき、その状態で相手パイプ２０２をリテーナ２１０内部に軸方向に挿入する。
このとき、リテーナ２１０は相手パイプ２０２の係合凸部２０４によって拡開方向に弾性的に押し拡げられ、そして係合凸部２０４が係合凹部２２５に到ったところで縮径運動するとともに、係合凸部２０４が係合凹部２２５に係合した状態となる。 In this connector 206, the retainer 210 is held by the retainer holding portion 216 of the connector main body 208, and the mating pipe 202 is inserted into the retainer 210 in the axial direction in this state.
At this time, the retainer 210 is elastically pushed and expanded in the expanding direction by the engagement convex portion 204 of the mating pipe 202, and when the engagement convex portion 204 reaches the engagement concave portion 225, the diameter of the retainer 210 is reduced. The joint convex portion 204 is engaged with the engaging concave portion 225.

尚、リテーナ２１０を予め相手パイプ２０２に装着しておいて、その状態で相手パイプ２０２をリテーナ２１０ごとコネクタ本体２０８に挿入するようにしても良い。
このとき、リテーナ２１０は一旦縮径運動した後、掛止溝２２６が掛止部２２４の位置に到ったところで拡開運動し、掛止溝２２６が掛止部２２４に掛止した状態となる。 The retainer 210 may be attached to the mating pipe 202 in advance, and the mating pipe 202 may be inserted into the connector main body 208 together with the retainer 210 in this state.
At this time, after the retainer 210 has once contracted in diameter, the retainer 210 expands when the latching groove 226 reaches the position of the latching portion 224, and the latching groove 226 is latched to the latching portion 224. .

上記シール部材としてのＯリング２１２及びブッシュ２１４は、リテーナ保持部２１６よりも奥側においてコネクタ本体２０８内部に装着保持されており、コネクタ本体２０８内に相手パイプ２０２が挿入された時点で、Ｏリング２１２又はこれらＯリング２１２及びブッシュ２１４が相手パイプ２０２の挿入端部２３２、即ち係合凸部２０４よりも先端側の挿入端部２３２の外周面に気密に接触して、かかる相手パイプ２０２とコネクタ本体２０８との間を気密にシールする。
尚、図１１（Ａ）ではＯリング２１２を２つ用いているが、（Ｂ）に示しているようにコンパクト化のためにＯリング２１２を１つだけ用いる場合もある。 The O-ring 212 and the bushing 214 as the sealing members are mounted and held inside the connector main body 208 on the back side of the retainer holding portion 216, and when the mating pipe 202 is inserted into the connector main body 208, the O-ring. 212 or these O-rings 212 and the bushing 214 come into airtight contact with the outer peripheral surface of the insertion end 232 of the mating pipe 202, that is, the insertion end 232 on the tip side of the engagement convex portion 204, and The space between the main body 208 is hermetically sealed.
In FIG. 11A, two O-rings 212 are used. However, as shown in FIG. 11B, only one O-ring 212 may be used for compactness.

以上から分るように、このようなコネクタ２０６を用いた接続では、樹脂チューブ２００をワンタッチで簡単に相手パイプ２０２に接続することができる。   As can be seen from the above, in the connection using such a connector 206, the resin tube 200 can be easily connected to the mating pipe 202 with one touch.

ここで従来の樹脂チューブ２００は、例えば内径が６ｍｍ、外径が８ｍｍ程度の太さのものが用いられて、図１３に示しているような配管系統で使用されている。
この配管系統では、燃料タンク２３４内の燃料を燃料ポンプ２３６により一定圧力の下で供給路２３８を通じて供給し、これをインジェクタ２４０からエンジンのシリンダ２４２に向けて噴射し、そして余剰の燃料を返送路２４４を通じて燃料タンク２３４へと返送する。 Here, a conventional resin tube 200 having a diameter of, for example, an inner diameter of 6 mm and an outer diameter of about 8 mm is used in a piping system as shown in FIG.
In this piping system, the fuel in the fuel tank 234 is supplied through the supply path 238 under a constant pressure by the fuel pump 236, and this is injected from the injector 240 toward the cylinder 242 of the engine, and surplus fuel is returned to the return path. It is returned to the fuel tank 234 through 244.

また車体への組付けとしては、予め定められた配管のレイアウトに従って予め樹脂チューブ２００を曲り形状に成形しておき、そしてその両端部又は片方端部にコネクタ２０６を装着した上で組付けの現場に持ち来たして車体への組付けを行っていた。
しかしながらこの曲り形状をなす樹脂チューブ２００は、直管状の樹脂チューブを拘束型に嵌め込んで形状拘束した上、樹脂チューブ全体を加熱オーブン中に入れて、例えば１５０〜１６０℃で２０〜３０分間加熱して曲げ形状を付与し、しかる後これらをオーブンから取り出して冷却した上、樹脂チューブを拘束型から外すといった手順で製造するなど（例えば下記特許文献２に開示）、工程数が多くなってコスト高となり、また車種が異なる毎に、厳密には配管レイアウトが異なる毎に別種の専用の樹脂チューブ２００が必要となって、これもまたコストを高める要因となっていた。 As for the assembly to the vehicle body, the resin tube 200 is formed in a bent shape in advance according to a predetermined piping layout, and the connector 206 is attached to both ends or one end of the resin tube 200 before assembling. Was brought to the car and assembled to the car body.
However, the resin tube 200 having the bent shape is constrained by fitting a straight tubular resin tube into a constraining mold, and the entire resin tube is placed in a heating oven and heated at, for example, 150 to 160 ° C. for 20 to 30 minutes. Then, after bending them, taking them out of the oven, cooling them, and then manufacturing the resin tube by removing the resin tube from the constraining mold (for example, disclosed in Patent Document 2 below), the number of steps increases and the cost increases. Every time the vehicle type is different and, strictly speaking, every time the piping layout is different, a different type of resin tube 200 is required, which also increases the cost.

ところで、近年燃料タンク２３４から余剰の燃料を供給せずに必要な量だけ即ち消費分だけをエンジン側に供給し、図１３の配管系統（いわゆるフューエルリターンシステム）のように余剰の燃料を燃料タンク２３４に戻すといったことを行わない配管系統、いわゆるフューエルリターンレスシステムが用いられるようになって来ている。   By the way, in recent years, the surplus fuel is not supplied from the fuel tank 234, but only a necessary amount, that is, a consumption amount is supplied to the engine side, and surplus fuel is supplied to the fuel tank as in a piping system (so-called fuel return system) in FIG. Piping systems that do not return to H.234, so-called fuel returnless systems have come to be used.

このフューエルリターンレスシステムでは必要な量の燃料のみを供給するので、図１３で示す配管系統と同じ径の樹脂チューブ２００を用いると燃料が滞留し易く、エンジンルーム内の雰囲気により滞留状態の燃料が配管内で気化し、エンジン回転数が不安定になり易くなる。
この場合の樹脂チューブ２００としては、例えば外径６ｍｍ以下の細径樹脂チューブを用い、燃料の滞留を起さないようにすることが好ましい。 In this fuel returnless system, only a necessary amount of fuel is supplied. Therefore, if the resin tube 200 having the same diameter as that of the piping system shown in FIG. 13 is used, the fuel is likely to stay, and the staying fuel is caused by the atmosphere in the engine room. Vaporization in the piping tends to make the engine speed unstable.
As the resin tube 200 in this case, it is preferable to use, for example, a thin resin tube having an outer diameter of 6 mm or less so as not to cause fuel retention.

このような細径の樹脂チューブは大径の樹脂チューブに比べて可撓性が高く、そこで本発明者等は樹脂チューブを予め曲り形状に成形しておかないで、直管状に成形しておき、その両端部又は片方端部にコネクタを装着した上で組み付けの現場に持ち来たし、そこで樹脂チューブを曲げながら配管組付けする組付構造を案出した。   Such a small diameter resin tube is more flexible than a large diameter resin tube. Therefore, the present inventors have not formed the resin tube into a bent shape in advance, but formed it into a straight tube. Then, the connector was attached to both ends or one end of the assembly and brought to the assembly site, where an assembly structure was devised in which piping was assembled while bending the resin tube.

このようにすれば、樹脂チューブに要するコストを安価となし得、また共通の樹脂チューブを様々な車種や配管レイアウトに対して汎用的に使用することも可能となる。
この点は必ずしも細径の樹脂チューブに限らず、径が比較的大きいものであっても可撓性に優れたものについても同様である。 In this way, the cost required for the resin tube can be reduced, and the common resin tube can be used for various vehicle types and piping layouts for general purposes.
This point is not necessarily limited to a thin resin tube, and the same applies to a tube having a relatively large diameter and excellent flexibility.

但し、樹脂チューブにあっては組付けの際に一旦折れ（キンク）を生ずると元に戻らず、使用できなくなってしまうといった問題があり、従って燃料輸送用として用いる場合には、これを曲げたときに折れ（座屈，キンク）を起し難いものであることが求められる。   However, the resin tube has a problem that once it is broken (kink) when assembled, it cannot be restored and cannot be used. Therefore, it is bent when used for fuel transportation. Sometimes it is required that it is difficult to bend (buckling, kink).

なお、樹脂チューブ２００の端部に装着されるコネクタとして、特許文献３に記載されたようなコネクタを用いることができる。このコネクタ３００は、図１４及び図１５に示すように、比較的薄肉状のリテーナ３０２を、リテーナ保持部３０４に軸直角方向に取り付ける型のものである。   In addition, as a connector with which the edge part of the resin tube 200 is mounted | worn, the connector as described in patent document 3 can be used. As shown in FIGS. 14 and 15, this connector 300 is of a type in which a relatively thin retainer 302 is attached to a retainer holding portion 304 in a direction perpendicular to the axis.

コネクタ３００は、全体として筒状を成すコネクタ本体（ここでは全体が樹脂製）３０６と、リテーナ３０２及びシール部材としてのＯリング３０８、ブッシュ３１０とを有している（図１４（Ａ）参照）。   The connector 300 includes a connector main body (here, entirely made of resin) 306, a retainer 302, an O-ring 308 as a seal member, and a bush 310 (see FIG. 14A). .

上記コネクタ本体３０６は、軸方向の一方の側に短い筒形のリテーナ保持部３０４を有しており、また他方の側に、例えば樹脂チューブ２００との接続部３１２を有している。   The connector main body 306 has a short cylindrical retainer holding portion 304 on one side in the axial direction, and has a connecting portion 312 with the resin tube 200 on the other side, for example.

リテーナ３０２は、一対の係合部（リテーナ側係合部、リテーナ側掛止部）３１４の両側をそれぞれ、Ｖ字状体３１６で一体的に連結して構成された環状体の形態を有し（図１４（Ｂ）参照）、細く変形させた状態で、リテーナ保持部３０４に設けられた開口部３１８から、リテーナ保持部３０４内に差し込まれ、元の形に広がった状態でリテーナ保持部３０４内に一体化して配置される。   The retainer 302 has a form of an annular body configured by integrally connecting both sides of a pair of engaging portions (retainer side engaging portion, retainer side latching portion) 314 with a V-shaped body 316, respectively. (Refer to FIG. 14 (B)). In a state of being thinly deformed, the retainer holding portion 304 is inserted into the retainer holding portion 304 from the opening 318 provided in the retainer holding portion 304 and spreads to its original shape. It is arranged in an integrated manner.

リテーナ３０２内に相手パイプ２０２（図１１に示す相手パイプ２０２とは若干形状が異なる）を挿入すると、係合部３１４の傾斜案内カム面３２０に係合凸部２０４が当接し、係合凸部２０４は、傾斜案内面又は傾斜案内カム面３２０を径方向外側に押し退け、リテーナ３０２を広げながら進行する。係合凸部２０４が係合部３１４を越えるとすぐに、リテーナ３０２は細くなるように若干変形し、係合部３１４は係合凸部２０４と軸方向に係合する（図１５参照）。係合部３１４は、リテーナ保持部３０４の切欠き（本体側掛止部）３２２内に入り込んでリテーナ保持部３０４と軸方向に係合している。このようにして、相手パイプ２０２とリテーナ３０２、あるいはコネクタ本体３０６とが軸方向に固定状態となる。そして、リテーナ３０２の押圧部３２４を径方向両側から押圧し、係合部３１４を押し広げることにより、相手パイプ２０２を抜き出すことができる。なお、図１６に示すように、押圧部３２４が外側に突出しないように、開口部３１８に囲い部３２６を突出形成しておく場合もある。   When the mating pipe 202 (slightly different shape from the mating pipe 202 shown in FIG. 11) is inserted into the retainer 302, the engaging convex portion 204 comes into contact with the inclined guide cam surface 320 of the engaging portion 314, and the engaging convex portion. 204 progresses while expanding the retainer 302 by pushing the inclined guide surface or the inclined guide cam surface 320 radially outward. As soon as the engaging convex portion 204 exceeds the engaging portion 314, the retainer 302 is slightly deformed so as to become thinner, and the engaging portion 314 engages with the engaging convex portion 204 in the axial direction (see FIG. 15). The engaging portion 314 enters the notch (main body side latching portion) 322 of the retainer holding portion 304 and is engaged with the retainer holding portion 304 in the axial direction. In this way, the mating pipe 202 and the retainer 302 or the connector main body 306 are fixed in the axial direction. The mating pipe 202 can be extracted by pressing the pressing portions 324 of the retainer 302 from both sides in the radial direction and expanding the engaging portions 314. In addition, as shown in FIG. 16, the enclosure part 326 may be protruded and formed in the opening part 318 so that the press part 324 may not protrude outside.

また、特許文献４に記載されているようなコネクタを用いることもできる。このコネクタ４００は、図１７及び１８に示すように、コ字状のリテーナ４０２をリテーナ保持部４０４に軸直角方向に取り付ける型のものであり、さらに相手パイプ２０２の接続を確認するチェッカー部材４０６を備えている。   A connector as described in Patent Document 4 can also be used. 17 and 18, this connector 400 is of a type in which a U-shaped retainer 402 is attached to the retainer holding portion 404 in the direction perpendicular to the axis, and a checker member 406 for confirming the connection of the mating pipe 202 is provided. I have.

コネクタ４００は、全体として筒状を成すコネクタ本体（ここでは全体が樹脂製）４０８と、リテーナ４０２及びシール部材としてのＯリング４１０、ブッシュ４１２とを有し、さらにチェッカー部材４０６を有している（図１７及び１８（Ｂ）参照）。   The connector 400 includes a connector main body (in this case, entirely made of resin) 408, a retainer 402, an O-ring 410 as a seal member, and a bush 412, and further includes a checker member 406. (See FIGS. 17 and 18B).

上記コネクタ本体４０８は、軸方向の一方の側に短い筒形のリテーナ保持部４０４を有しており、また、他方の側に、例えば樹脂チューブ２００との接続部４１４を有している。   The connector main body 408 has a short cylindrical retainer holding portion 404 on one side in the axial direction, and a connection portion 414 with, for example, the resin tube 200 on the other side.

チェッカー部材４０６は、一対の弾性アーム４１６の端部に掛止溝４１８を有する箱型のものであり、その掛止溝４１８が底面部４２０と係合するように、リテーナ保持部４０４の外周に、軸直角方向に取り付けられ、このリテーナ保持部４０４に配置される。   The checker member 406 is a box-shaped member having a latching groove 418 at the ends of a pair of elastic arms 416, and is arranged on the outer periphery of the retainer holding unit 404 so that the latching groove 418 engages with the bottom surface part 420. The retainer holding portion 404 is disposed in a direction perpendicular to the axis.

リテーナ４０２は、一対の検知片４２２の端部（自由端部）に、径方向内側に突出する検知突起４２４を有していて、この検知突起４２４が、相手パイプ２０２の係合凸部２０４の移動路内に突出するように、リテーナ保持部４０４の外周に、軸直角方向に取り付けられ、このリテーナ保持部４０４に配置される（図１８（Ａ）参照）。   The retainer 402 has a detection protrusion 424 that protrudes inward in the radial direction at the end (free end) of the pair of detection pieces 422, and the detection protrusion 424 corresponds to the engagement protrusion 204 of the mating pipe 202. The retainer holding portion 404 is attached to the outer periphery of the retainer holding portion 404 in a direction perpendicular to the axis so as to protrude into the moving path, and is disposed on the retainer holding portion 404 (see FIG. 18A).

相手パイプ２０２が、コネクタ本体４０８に挿入され、係合凸部２０４がブッシュ４１２に当接した状態（相手パイプ２０２の正常な接続状態）では、リテーナ４０２の検知突起４２４は、傾斜案内面又は傾斜案内カム面４２５を径方向外側に押し退けながら進行した係合凸部２０４によって押され、径方向外側に移動し、検知突起４２４と受入孔４２８の凹部４３０との係合が解除されていて、リテーナ４０２をさらに軸直角方向に押し込むことが可能となっている。リテーナ４０２が軸直角方向に押し込まれると、リテーナ４０２の係合部（リテーナ側係合部）４３１が相手パイプ２０２の係合凸部２０４と係合するとともに、リテーナ４０２のガイド片４３２にチェッカー部材４０６の弾性アーム４１６が押されて、弾性アーム４１６の掛止溝４１８が径方向外側に移動し、掛止溝４１８と底面部４２０との係合が解除される。このようにして、相手パイプ２０２とコネクタ本体４０８とが軸方向に固定状態となり、この固定状態では、チェッカー部材４０６とコネクタ本体４０８とが分離可能となっている。すなわち、相手パイプ２０２が正常に接続されている場合に限り、チェッカー部材４０６をコネクタ本体４０８から外すことができる。なお、リテーナ４０２は、規制フランジ（本体側掛止部）４３４、４３６、４３８と、前端面、中間溝部及び後端面（リテーナ側掛止部）で軸方向に係合する。   In a state in which the mating pipe 202 is inserted into the connector main body 408 and the engaging convex portion 204 is in contact with the bush 412 (normal mating state of the mating pipe 202), the detection projection 424 of the retainer 402 is inclined to the inclined guide surface or inclined The guide cam surface 425 is pushed by the engaging convex portion 204 that has advanced while being pushed outward in the radial direction, moved outward in the radial direction, and the engagement between the detection projection 424 and the concave portion 430 of the receiving hole 428 is released, and the retainer It is possible to push 402 further in the direction perpendicular to the axis. When the retainer 402 is pushed in the direction perpendicular to the axis, the engaging portion (retainer side engaging portion) 431 of the retainer 402 engages with the engaging convex portion 204 of the mating pipe 202 and the checker member is attached to the guide piece 432 of the retainer 402. When the elastic arm 416 of 406 is pushed, the latching groove 418 of the elastic arm 416 moves radially outward, and the engagement between the latching groove 418 and the bottom surface portion 420 is released. In this way, the mating pipe 202 and the connector main body 408 are fixed in the axial direction, and in this fixed state, the checker member 406 and the connector main body 408 can be separated. That is, the checker member 406 can be removed from the connector body 408 only when the mating pipe 202 is normally connected. The retainer 402 is engaged in the axial direction with restriction flanges (main body side latching portions) 434, 436, and 438, front end surfaces, intermediate groove portions, and rear end surfaces (retainer side latching portions).

特開平１１−２０１３５５号公報JP-A-11-2013355 特開平６−１９０９１３号公報Japanese Patent Laid-Open No. 6-190913 特許第２６４１６８３号公報Japanese Patent No. 2641683 特開２００４−２５１３１９号公報JP 2004-251319 A

本発明は以上のような事情を背景とし、車体への組付けに際して相手パイプとの接続のための金具のかしめを必要とせず、簡単に相手パイプと接続ができるとともに、曲げ力を加えても折れを生じ難い樹脂チューブを主要素として備えた配管部材を提供することを目的としてなされたものである。   The present invention is based on the circumstances as described above, and does not require caulking of a metal fitting for connection to a mating pipe when assembled to a vehicle body, and can be easily connected to the mating pipe and can be applied with bending force. The present invention has been made for the purpose of providing a piping member provided with a resin tube as a main element which is not easily broken.

而して請求項１のものは、エンジンと燃料タンクとの間に配管されて燃料を輸送する配管部材であって、（Ａ）該配管部材の主要素を成す樹脂チューブと、（Ｂ）該樹脂チューブの端部に装着された、相手パイプとの接続用のコネクタとを有しており、該コネクタは、（ａ）軸方向の一方側にリテーナ保持部を、他方側に前記樹脂チューブとの接続部を供えたコネクタ本体と、（ｂ）該リテーナ保持部にて保持され、前記相手パイプと係合して軸方向に固定するリテーナと、（ｃ）該相手パイプの外周面に気密に接触してシール作用を成すシール部材と、を有しており、前記樹脂チューブは、内側の燃料バリア層と外側のＰＡ層との積層構造をなし又は有していて、更にその外周面が保護層にて被覆されており、且つ該保護層を除いたチューブ外径が６ｍｍ以下の細径チューブであって、該チューブの外径ｄと肉厚ｔの比率ｄ／ｔが４〜８となしてあることを特徴とする。   Thus, according to the first aspect of the present invention, there is provided a piping member that is piped between the engine and the fuel tank to transport the fuel, and (A) a resin tube that constitutes a main element of the piping member; A connector for connecting to a mating pipe, which is attached to the end of the resin tube, and (a) a retainer holding portion on one side in the axial direction and the resin tube on the other A connector main body provided with a connecting portion; (b) a retainer that is held by the retainer holding portion and engages with the mating pipe and is fixed in an axial direction; and (c) an airtight seal on the outer peripheral surface of the mating pipe. A sealing member that contacts and forms a sealing action, and the resin tube has or has a laminated structure of an inner fuel barrier layer and an outer PA layer, and further protects the outer peripheral surface thereof. The chew is covered with a layer and the protective layer is removed. Outer diameter a following thin tube 6 mm, the ratio d / t of an outer diameter d and wall thickness t of the tube, characterized in that the are without the 4-8.

コネクタ本体は、例えば、軸方向一方側（軸方向の一端側）にソケット状のリテーナ保持部を、他方側（他端側）に樹脂チューブとの接続部を備えることができる。   The connector body can include, for example, a socket-like retainer holding portion on one side in the axial direction (one end side in the axial direction) and a connection portion with a resin tube on the other side (the other end side).

請求項３のものは、請求項１又は２において、前記燃料バリア層がＥＴＦＥであることを特徴とする。   According to a third aspect of the present invention, in the first or second aspect, the fuel barrier layer is ETFE.

請求項４のものは、請求項１又は２において、前記燃料バリア層の主成分がＥＴＦＥ，ＴＰＥＥ，ＰＢＴ，ＰＢＮ，ＰＰＳ，ＰＥ，ＰＰ，ＰＶＤＦ，ＥＶＯＨの何れかであることを特徴とする。   According to a fourth aspect of the present invention, in the first or second aspect, the main component of the fuel barrier layer is any one of ETFE, TPEE, PBT, PBN, PPS, PE, PP, PVDF, and EVOH.

請求項５のものは、請求項１〜４の何れかにおいて、前記樹脂チューブの両端部が前記コネクタに対して圧入又は溶着により接続されていることを特徴とする。   According to a fifth aspect of the present invention, in any one of the first to fourth aspects, both end portions of the resin tube are connected to the connector by press-fitting or welding.

請求項６のものは、請求項１〜５の何れかにおいて、前記コネクタには前記相手パイプと該コネクタとを接続したときに該コネクタから外れるチェッカー部材が装着されていることを特徴とする。   According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the connector is provided with a checker member that is detached from the connector when the mating pipe and the connector are connected.

請求項７のものは、請求項１〜６の何れかにおいて、前記コネクタには前記相手パイプとの接続前において接続用の開口を閉鎖する閉鎖部材が装着されていることを特徴とする。   According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the connector is provided with a closing member that closes the connection opening before the connection with the mating pipe.

請求項８のものは、請求項１〜７の何れかにおいて、前記配管部材が前記燃料タンクから該エンジンのインジェクタに燃料供給する一方、該インジェクタから該燃料タンクへの燃料の戻しを行わないフューエルリターンレスシステムの配管用として用いられるものであることを特徴とする。   According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the fuel is supplied from the fuel tank to the injector of the engine while the piping member does not return the fuel from the injector to the fuel tank. It is used for piping of a returnless system.

以上のように本発明は、コネクタ本体，リテーナ及びシール部材を有する、相手パイプとの接続用のコネクタと、内側の燃料バリア層，外側のＰＡ層を有する樹脂チューブを組み合せて配管部材を構成し、且つ保護層を除いたチューブ外径が６ｍｍ以下の細径チューブとなして、更に保護層を除いた外径ｄと保護層を除いた肉厚ｔの比率ｄ／ｔを４〜８となしたもので、本発明によれば、コネクタによって少ない手間で簡単に相手パイプと配管部材とを接続作業することができ、また後に明らかにされるように、外径と肉厚との比率を上記比率の範囲内に抑えることによって、樹脂チューブに対し曲げ力を加えた場合にも樹脂チューブが折れを生じるのを有効に防止することができ、樹脂チューブを曲げながら車体に配管組付けするに際してその組付作業を容易に行うことができる。   As described above, the present invention constitutes a piping member by combining a connector body having a connector body, a retainer, and a seal member, and a connector tube for connection with a mating pipe, and a resin tube having an inner fuel barrier layer and an outer PA layer. In addition, the tube outer diameter excluding the protective layer is 6 mm or less, and the ratio d / t between the outer diameter d excluding the protective layer and the wall thickness t excluding the protective layer is 4-8. Therefore, according to the present invention, it is possible to easily connect the mating pipe and the piping member with a small amount of effort by the connector, and, as will be clarified later, the ratio of the outer diameter to the wall thickness is By keeping the ratio within the range, it is possible to effectively prevent the resin tube from bending even when a bending force is applied to the resin tube. It is possible to perform the work with the set easily.

詳しくは、車体に搭載される各機器の隙間をぬって限られた狭い配管スペース内で、定められた配管レイアウトに従い樹脂チューブを曲げながら固定クランプにて樹脂チューブを車体に止め付け配管作業する際、樹脂チューブを緩やかな湾曲形状から急な湾曲形状、即ち大きなＲ形状から小さなＲ形状に曲率を変化させつつ固定クランプにて固定する場合と、逆に小さなＲ形状から大きなＲ形状に曲げを緩めながら固定クランプにて固定する場合とがあり、それらの何れの方式をも用いることができれば配管部材即ち樹脂チューブの取り回し作業を楽に行うことができる。   For details, in a narrow piping space with a gap between each device mounted on the vehicle body, the resin tube is fixed to the vehicle body with a fixed clamp while the resin tube is bent according to the specified piping layout. When the resin tube is fixed with a fixed clamp while changing the curvature from a gently curved shape to a sharply curved shape, that is, from a large R shape to a small R shape, the resin tube is loosened from a small R shape to a large R shape. However, it may be fixed by a fixing clamp, and if any of these methods can be used, the piping member, that is, the resin tube can be easily handled.

そのためには樹脂チューブを所定の曲率半径で曲げたとき、具体的には望ましくは半径（Ｒ）５０ｍｍ以下で、より望ましくは半径（Ｒ）３０ｍｍ以下で曲げたときに樹脂チューブが折れ（座屈，キンク）を起さないことが望ましい。   For this purpose, when the resin tube is bent at a predetermined radius of curvature, specifically, the resin tube is bent (buckled) when it is bent preferably at a radius (R) of 50 mm or less, more preferably at a radius (R) of 30 mm or less. , Kink) is desirable.

本発明に従い外径ｄと肉厚ｔとの比率ｄ／ｔを４．０〜８．０としたとき、そのような折れを生じることなく良好に樹脂チューブを曲げながら配管組付けし得ることを確認した。
従って本発明によれば、樹脂チューブとコネクタとを組み合せて成る配管部材を車体に配管組付けするに際し、その組付作業を容易に行うことができる。 According to the present invention, when the ratio d / t between the outer diameter d and the wall thickness t is 4.0 to 8.0, the pipe can be assembled while bending the resin tube well without causing such bending. confirmed.
Therefore, according to the present invention, when the piping member formed by combining the resin tube and the connector is assembled to the vehicle body, the assembling work can be easily performed.

ここでコネクタにおけるリテーナは、径方向に弾性変形可能かつコネクタ本体とは別体又は一体の部材であって、例えば、リテーナ保持部の側に形成された本体側掛止部に対して、例えば径方向内方から嵌り合って、軸方向に掛止し固定されるリテーナ側掛止部と、リテーナへの相手パイプの挿入時にリテーナを弾性的に拡開させるためのカム面（ガイド面又は当接面）又は内周カム面（内周ガイド面又は内周当接面）、あるいは、リテーナのリテーナ保持部への挿入時にリテーナを弾性的に縮径させるためのカム面（ガイド面又は当接面）又は外周カム面（外周ガイド面又は外周当接面）の少なくとも何れかを備えたものとなしておくことができる。   Here, the retainer in the connector is a member that is elastically deformable in the radial direction and is a separate member or an integral member from the connector body. For example, the retainer is formed on the side of the retainer holding portion. The retainer side latching part that is fitted from the inside in the direction and latched and fixed in the axial direction, and the cam surface (guide surface or abutment) for elastically expanding the retainer when the mating pipe is inserted into the retainer Surface) or inner peripheral cam surface (inner peripheral guide surface or inner peripheral contact surface), or cam surface (guide surface or contact surface) for elastically reducing the diameter of the retainer when inserted into the retainer holding portion of the retainer ) Or an outer peripheral cam surface (an outer peripheral guide surface or an outer peripheral abutment surface).

本発明において、樹脂チューブは外径が６ｍｍ以下の細径チューブであって可撓性の高いものであり、その可撓性を利用して上記のように固定クランプを用いて樹脂チューブを曲げながら所定の配管レイアウトに従って配管組付けを容易に行うことができる（外径と肉厚との関係を上記関係に規制することで折れを生じることなく）。   In the present invention, the resin tube is a thin tube having an outer diameter of 6 mm or less and is highly flexible, and the resin tube is bent using the fixed clamp as described above using the flexibility. Piping can be easily assembled according to a predetermined piping layout (without causing breakage by regulating the relationship between the outer diameter and the wall thickness to the above relationship).

本発明においては、上記燃料バリア層としてフッ素樹脂、特にＥＴＦＥを用いることができる（請求項３）。
フッ素樹脂は燃料バリア性に優れ、また加工性も良好であることから燃料バリア層として好適である。
ここで燃料バリア性とは、燃料（ガソリン）透過及び粗悪ガソリンに対する耐性である（粗悪ガソリンにはエタノール，メタノール，トルエン等を混合させたガソリンで樹脂チューブの内面にクラックを引き起こす）。
或いは燃料バリア層としてＥＴＦＥ，ＴＰＥＥ，ＰＢＴ，ＰＢＮ，ＰＰＳ，ＰＥ，ＰＰ，ＰＶＤＦ，ＥＶＯＨの何れかを主成分とするものを用いることができる（請求項４）。 In the present invention, a fluorine resin, particularly ETFE can be used as the fuel barrier layer.
A fluororesin is suitable as a fuel barrier layer because it has excellent fuel barrier properties and good workability.
Here, the fuel barrier property is permeation of fuel (gasoline) and resistance to bad gasoline (poor gasoline is mixed with ethanol, methanol, toluene, etc., causing cracks on the inner surface of the resin tube).
Alternatively, a fuel barrier layer containing ETFE, TPEE, PBT, PBN, PPS, PE, PP, PVDF, EVOH as a main component can be used.

また本発明において上記樹脂チューブは、その両端部をコネクタに対し圧入又は溶着により接続しておくことができる（請求項５）。
この場合、樹脂チューブを相手パイプに接続するに際して金具等のかしめ作業が不要であり、相手パイプとの接続を限られたスペースで無理なく極めて簡単に行うことができる。 In the present invention, both ends of the resin tube can be connected to the connector by press-fitting or welding (Claim 5).
In this case, when the resin tube is connected to the mating pipe, a caulking operation of a metal fitting or the like is unnecessary, and the mating pipe can be easily and extremely easily connected in a limited space.

またコネクタには、相手パイプとコネクタとを接続したときにコネクタから外れるチェッカー部材を装着しておくことができる（請求項６）。
このようにしておけば、チェッカー部材を回収することにより、目視でコネクタと相手部材との接続状態を確認する必要がなく、従って奥まった箇所など見えない箇所で接続を行った場合においても容易に接続の確認を行うことができる。 The connector can be attached with a checker member that comes off the connector when the mating pipe and the connector are connected.
By doing so, it is not necessary to visually check the connection state between the connector and the mating member by collecting the checker member, and therefore it is easy even when the connection is made at an invisible place such as a recessed part. You can check the connection.

次に請求項７は、上記コネクタに相手パイプとの接続前において接続用開口を閉鎖する閉鎖部材を装備したもので、このようにしておけば、閉鎖部材によってコネクタを通じ樹脂チューブ内部にごみその他の異物が入り込むのを良好に防止することができる。
ここでは、樹脂チューブの両端部にコネクタを取り付け、それぞれのコネクタに閉鎖部材を装着しておくことができる。また両端部のコネクタの一方の閉鎖部材を取り外し、他方にだけ閉鎖部材を残しておくことで、一方の側から樹脂チューブ内部に圧力を加えて、樹脂チューブとコネクタとの接続部分における漏れの有無を簡単に確認することができる。 Next, according to a seventh aspect of the present invention, the connector is equipped with a closing member that closes the connection opening before the connection with the mating pipe. It is possible to satisfactorily prevent foreign substances from entering.
Here, a connector can be attached to both ends of the resin tube, and a closing member can be attached to each connector. Also, by removing one closing member of the connector at both ends and leaving the closing member only on the other side, pressure is applied to the inside of the resin tube from one side, so that there is no leakage at the connection portion between the resin tube and the connector Can be easily confirmed.

本発明の配管部材は、燃料タンクからエンジンのインジェクタに燃料供給する一方、インジェクタから燃料タンクへの燃料の戻しを行わないフューエルリターンレスシステムの配管用として特に好適なものである（請求項８）。
本発明の樹脂チューブは外径が６ｍｍ以下の細径チューブであり、フューエルリターンレスシステムの配管用として用いた場合において、燃料の送りの流速が遅くならず、従って樹脂チューブ内部で燃料流体の温度上昇を抑制することができて、かかるフューエルリターンレスシステムの配管用として好適なものである。 The piping member of the present invention is particularly suitable for piping of a fuel returnless system in which fuel is supplied from a fuel tank to an injector of an engine but fuel is not returned from the injector to the fuel tank. .
The resin tube of the present invention is a thin tube having an outer diameter of 6 mm or less, and when used for piping of a fuel returnless system, the flow rate of the fuel feed is not slow, and therefore the temperature of the fuel fluid inside the resin tube. The rise can be suppressed, and it is suitable for piping of such a fuel returnless system.

次に本発明を小型車両のエンジンと燃料タンクとの間に配管されて燃料輸送する配管部材に適用した場合の実施形態を図面に基づいて詳しく説明する。
ここで小型車両とは軽自動車、特に自動二輪車，自動三輪車，ＡＴＶ（All Terrain Vehicle）等を意味する。 Next, an embodiment in which the present invention is applied to a piping member that is piped between an engine and a fuel tank of a small vehicle and transports fuel will be described in detail with reference to the drawings.
Here, the small vehicle means a light vehicle, in particular, a motorcycle, a tricycle, an ATV (All Terrain Vehicle), and the like.

図２において、１０は車体に固定されたエンジンや燃料タンク等の機器に一体に形成された相手パイプで、外周面に環状に突出する係合凸部（パイプ側係合部）１２が形成されている。
図５は、配管部材１３を車体への組付け前の状態で表したもので、図中１４は樹脂チューブを、１６はその両端部に装着されたコネクタ（クイックコネクタ）を示している。なお、相手パイプ１０等の相手部材に一方端部を直接圧入等で接続する場合には、コネクタ１６は樹脂チューブ１４の他方端部（片方端部）のみに装着される。
ここで樹脂チューブ１４は、組付け前の状態で直管形状を成している。即ち樹脂チューブ１４は直管形状に成形されている。 In FIG. 2, reference numeral 10 denotes a mating pipe formed integrally with a device such as an engine or a fuel tank fixed to the vehicle body, and an engagement convex portion (pipe side engagement portion) 12 protruding in an annular shape is formed on the outer peripheral surface. ing.
FIG. 5 shows the piping member 13 in a state before being assembled to the vehicle body. In the figure, reference numeral 14 denotes a resin tube, and 16 denotes connectors (quick connectors) attached to both ends thereof. When one end is directly connected to a mating member such as the mating pipe 10 by direct press fitting or the like, the connector 16 is attached only to the other end (one end) of the resin tube 14.
Here, the resin tube 14 has a straight pipe shape before being assembled. That is, the resin tube 14 is formed in a straight pipe shape.

尚、配管部材１３はフューエルリターンレスシステム用としても、また余剰のガソリンを燃料タンクに戻すシステム（フューエルリターンシステム）用としても用い得るが、特に前者のフューエルリターンレスシステム用として好適である。
樹脂チューブ１４は、図５（Ｂ）に示しているように内側の燃料バリア層としてのフッ素樹脂の層、ここではＥＴＦＥ層１４Ａと、外側のＰＡ１２層１４Ｂとの積層構造を成しており、その外周面上に、後述の固定クランプ４８（図１，図３，図４）によるクランプ箇所において樹脂チューブ１４を保護し、傷付き防止するゴム（ここではＥＰＤＭ）から成る保護層１５が全長に亘り被覆状態に積層されている。 The piping member 13 can be used for both a fuel returnless system and a system for returning surplus gasoline to the fuel tank (fuel return system), but is particularly suitable for the former fuel returnless system.
As shown in FIG. 5B, the resin tube 14 has a layered structure of a fluorine resin layer as an inner fuel barrier layer, here an ETFE layer 14A and an outer PA12 layer 14B. On the outer peripheral surface, a protective layer 15 made of rubber (here, EPDM) that protects the resin tube 14 at a clamp location by a later-described fixed clamp 48 (FIGS. 1, 3, and 4) and prevents scratches (here, EPDM) is provided over the entire length. It is laminated in a covering state.

尚、燃料バリア層としてＥＴＦＥ以外に以下のものを用いても良い。即ちフッ素樹脂としては、例えば上記のエチレン−テトラフルオロエチレン共重合体（ＥＴＦＥ）の他、ポリビニリデンフルオライド（ＰＶＤＦ），ポリビニルフロライド（ＰＶＦ），ポリクロロトリフルオロエチレン（ＣＴＦＥ），エチレン−クロロトリフルオロエチレン共重合体（ＥＣＴＦＥ），エチレン−テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体，ヘキサフルオロプロピレン−テトラフルオロエチレン共重合体（ＦＥＰ），ポリテトラフルオロエチレン（ＰＴＦＥ），テトラフルオロエチレン−パーフルオロアルキルビニルエーテル共重合体（ＰＦＡ），テトラフルオロエチレン−ヘキサフルオロプロピレン−パーフルオロアルコキシエチレン３元共重合体，フッ化ビニリデン−テトラフルオロエチレン共重合体，フッ化ビニリデン−ヘキサフルオロプロピレン共重合体，テトラフルオロエチレン−ヘキサフルオロプロピレン−フッ化ビニリデン３元共重合体（ＴＨＶ），ヘキサフルオロプロピレン−パーフルオロアルキルビニルエーテル，ビニリデンフロライド−クロロトリフルオロエチレン共重合体，ビニリデンフロライド−パーフルオロアルキルビニルエーテル，ビニリデンフロライド（フッ化ビニリデン）−テトラフルオロエチレン−パーフルオロアルキルビニルエーテル，ビニリデンフロライド−ヘキサフルオロプロピレン−パーフルオロアルキルビニルエーテル，エチレン−テトラフルオロエチレン−パーフルオロアルキルビニルエーテル，エチレン−ヘキサフルオロプロピレン−パーフルオロアルキルビニルエーテル，エチレン−テトラフルオロエチレン−ヘキサフルオロプロピレン−パーフルオロアルキルビニルエーテル等を用いることができる。但しとりわけチューブ加工のし易さ等からＥＴＦＥが好適である。   In addition to ETFE, the following may be used as the fuel barrier layer. That is, as the fluororesin, for example, in addition to the above-mentioned ethylene-tetrafluoroethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polychlorotrifluoroethylene (CTFE), ethylene-chloro Trifluoroethylene copolymer (ECTFE), ethylene-tetrafluoroethylene-hexafluoropropylene copolymer, hexafluoropropylene-tetrafluoroethylene copolymer (FEP), polytetrafluoroethylene (PTFE), tetrafluoroethylene-par Fluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene-perfluoroalkoxyethylene terpolymer, vinylidene fluoride-tetrafluoroethylene copolymer Vinylidene fluoride-hexafluoropropylene copolymer, tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer (THV), hexafluoropropylene-perfluoroalkyl vinyl ether, vinylidene fluoride-chlorotrifluoroethylene copolymer Compound, vinylidene fluoride-perfluoroalkyl vinyl ether, vinylidene fluoride (vinylidene fluoride) -tetrafluoroethylene-perfluoroalkyl vinyl ether, vinylidene fluoride-hexafluoropropylene-perfluoroalkyl vinyl ether, ethylene-tetrafluoroethylene-perfluoro Alkyl vinyl ether, ethylene-hexafluoropropylene-perfluoroalkyl vinyl ether, ethylene-tetra Ruoroechiren - hexafluoropropylene - can be used perfluoroalkyl vinyl ether. However, ETFE is particularly preferable because of the ease of tube processing.

上記燃料バリア層の主成分として、上例以外にＴＰＥＥ（ポリエステル系熱可塑性エラストマー），ＰＢＴ（ポリブチレンテレフタレート），ＰＰＳ（ポリフェニレンサルファイド），ＰＥ（ポリエチレン），ＰＰ（ポリプロピレン），ＰＢＮ（ポリブチレンナフタレート），ＰＶＤＦ（ポリビニリデンフルオライド），ＥＶＯＨ（エチレン−ビニルアルコール共重合体）の何れかを好適に用いることができる。
これらの樹脂を主成分として、導電化，柔軟性，耐衝撃性等を改良したアロイ材を用いても良い。 As main components of the fuel barrier layer, TPEE (polyester thermoplastic elastomer), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), PE (polyethylene), PP (polypropylene), PBN (polybutylene) Any of phthalate), PVDF (polyvinylidene fluoride), and EVOH (ethylene-vinyl alcohol copolymer) can be preferably used.
An alloy material having these resins as the main components and improved conductivity, flexibility, impact resistance and the like may be used.

本実施形態において、この樹脂チューブ１４は内径又は内側層であるＥＴＦＥ層１４Ａの内径ｄ１がφ２．５ｍｍ，外側層１４Ｂの外径ｄ２（ｄ）がφ４ｍｍの細径のものである。
ここでＥＴＦＥ層１４Ａは肉厚が０．２ｍｍであり、またＰＡ層１４Ｂは肉厚が０．５５ｍｍ、更に保護層１５は肉厚が１．０ｍｍである。すなわち、内側層であるＥＴＦＥ層１４Ａ及び外側層１４Ｂの肉厚ｔは、０．７５ｍｍである。
また樹脂チューブ１４は、その全長Ｌが２００〜１５００ｍｍとされている。
但しこれらの積層構造，材質，肉厚や長さ等の寸法はあくまで一例であって、それらを様々に変更することができることは言うまでもない。 In the present embodiment, the resin tube 14 is intended inside diameter d 1 of the ETFE layer 14A is the inner diameter or inner layer is 2.5 mm, the outer diameter d 2 of the outer layer 14B (d) is a small-diameter .phi.4 mm.
Here, the ETFE layer 14A has a thickness of 0.2 mm, the PA layer 14B has a thickness of 0.55 mm, and the protective layer 15 has a thickness of 1.0 mm. That is, the wall thickness t of the ETFE layer 14A and the outer layer 14B which are the inner layers is 0.75 mm.
The resin tube 14 has an overall length L of 200 to 1500 mm.
However, these laminated structures, materials, thicknesses, lengths, and other dimensions are merely examples, and it goes without saying that they can be variously changed.

コネクタ１６は、図２，図６に示しているように全体として筒状を成すコネクタ本体（ここでは全体が樹脂製）１８と、リテーナ２０及びシール部材としてのＯリング２２，ブッシュ２４とを有している（例えば、Ｏリング２２はシール部材として機能し、ブッシュ２４はシール部材ではなく軸振れ防止部材として機能する）。
本実施形態において、コネクタ１６（シール部材を除く）はポリアミドにて構成されている。但しその材質は耐熱性，耐燃料透過性，耐ガソリン性（ガソリンに接しても膨潤し難い）やコストの点から適宜選択可能である。 As shown in FIGS. 2 and 6, the connector 16 has a connector body 18 (in this case, entirely made of resin) having a cylindrical shape, a retainer 20, an O-ring 22 as a seal member, and a bush 24. (For example, the O-ring 22 functions as a seal member, and the bush 24 functions as a shaft runout prevention member rather than a seal member).
In this embodiment, the connector 16 (excluding the seal member) is made of polyamide. However, the material can be appropriately selected from the viewpoints of heat resistance, fuel permeation resistance, gasoline resistance (which does not easily swell when in contact with gasoline) and cost.

具体的にはポリアミド系（ＰＡ１１，ＰＡ１２，Ｐ６，ＰＡ６６，ＰＰＡ等）やＰＰＳ等は耐熱性が優れ、ポリエステル系（ＰＢＴ，ＰＥＴ，ＰＥＮ等）は耐燃料透過性，耐ガソリン性に優れる。
またＰＯＭは耐熱性と耐燃料透過性，耐ガソリン性を確保しながら、比較的安価である。 Specifically, polyamide-based (PA11, PA12, P6, PA66, PPA, etc.), PPS, etc. are excellent in heat resistance, and polyester-based (PBT, PET, PEN, etc.) are excellent in fuel permeability resistance and gasoline resistance.
POM is relatively inexpensive while ensuring heat resistance, fuel permeation resistance, and gasoline resistance.

また上記材料に強度向上のためガラス繊維を配合したり、耐燃料透過性向上のためクレー等のナノコンポジット材を配合して用いることもできる。
これらの材料は樹脂チューブ１４の材料としても好適なものであり、また樹脂チューブ１４の材料としてはそれらの樹脂材料にエラストマーをアロイ化したものを用いることもでき、この場合樹脂そのものが有する耐熱性，耐燃料透過性に加え、樹脂チューブ１４に可撓性を付加することができる。 In addition, glass fibers can be blended with the above materials to improve strength, and nanocomposite materials such as clay can be blended to improve fuel permeability.
These materials are also suitable as the material of the resin tube 14, and as the material of the resin tube 14, those resin materials obtained by alloying an elastomer can be used, and in this case, the heat resistance of the resin itself. In addition to the fuel permeation resistance, flexibility can be added to the resin tube 14.

上記コネクタ本体１８は、図２に示しているように軸方向の一方の側にソケット状のリテーナ保持部２６を有しており、また他方の側に樹脂チューブ１４との接続部としての圧入部（ニップル部）２８を有している。
リテーナ保持部２６は、リテーナ２０を内部に収容状態で保持する部分で、コネクタ本体１８はこのリテーナ２０を介して相手パイプ１０と接続される。
このリテーナ保持部２６には、開口窓３０とリテーナ２０との掛止用の前端の掛止部（本体側掛止部）３２とが設けられている。開口窓３０は、径方向対称位置に一対設けられている。
一方リテーナ２０は、全体として略環状（ここでは断面Ｃ字状）をなす樹脂製の部材であって、径方向に弾性変形可能となしてある。 As shown in FIG. 2, the connector body 18 has a socket-like retainer holding portion 26 on one side in the axial direction, and a press-fit portion as a connection portion with the resin tube 14 on the other side. (Nipple part) 28 is provided.
The retainer holding portion 26 is a portion that holds the retainer 20 in an accommodated state, and the connector main body 18 is connected to the mating pipe 10 via the retainer 20.
The retainer holding portion 26 is provided with a front end latching portion (main body side latching portion) 32 for latching the opening window 30 and the retainer 20. A pair of opening windows 30 are provided at radially symmetric positions.
On the other hand, the retainer 20 is a resin member having a substantially annular shape (here, a C-shaped cross section) as a whole, and is elastically deformable in the radial direction.

このリテーナ２０には、相手パイプ１０の係合凸部１２を径方向内方から係合させてこれを軸方向に固定する係合凹部又は係合スリット部（リテーナ側係合部）３４と、コネクタ本体１８側の上記掛止部３２に対し、同じく径方向内方から嵌り合って軸方向に掛止する掛止溝（リテーナ側掛止部）３６とが設けられている。
リテーナ２０は、この掛止溝３６をリテーナ保持部２６の掛止部３２に掛止させることで、かかるリテーナ保持部２６により軸方向に固定状態に保持される。 The retainer 20 has an engagement concave portion or an engagement slit portion (retainer side engagement portion) 34 for engaging the engagement convex portion 12 of the mating pipe 10 from the inside in the radial direction and fixing it in the axial direction, A latching groove (retainer side latching portion) 36 that is fitted from the inside in the radial direction and latched in the axial direction is provided on the latching portion 32 on the connector main body 18 side.
The retainer 20 is held in a fixed state in the axial direction by the retainer holding portion 26 by hooking the hook groove 36 on the hook portion 32 of the retainer holding portion 26.

このリテーナ２０にはまた、内周面と外周面とにテーパ形状の内周カム面３８と外周カム面４０とが形成されている。
内周カム面３８は、相手パイプ１０をリテーナ２０内部に軸方向に挿入したとき、係合凸部１２と当接してその移動案内をなすとともに、係合凸部１２の移動に伴ってリテーナ２０をカム作用で全体的に且つ弾性的に拡開運動させ、係合凸部１２の通過を許容する。
そして係合凸部１２が係合凹部３４の位置に到ったところでリテーナ２０が全体的に元の形状に復形し、これと同時に係合凸部１２が係合凹部３４に嵌り合って、それらが軸方向に互いに固定状態となる。 The retainer 20 is also formed with an inner peripheral cam surface 38 and an outer peripheral cam surface 40 having tapered shapes on the inner peripheral surface and the outer peripheral surface.
When the mating pipe 10 is inserted into the retainer 20 in the axial direction, the inner circumferential cam surface 38 abuts against the engaging convex portion 12 to guide its movement, and the retainer 20 is moved along with the movement of the engaging convex portion 12. Is expanded and elastically moved by the cam action, and the passage of the engaging convex portion 12 is allowed.
Then, when the engaging convex portion 12 reaches the position of the engaging concave portion 34, the retainer 20 is restored to the original shape as a whole, and at the same time, the engaging convex portion 12 fits into the engaging concave portion 34, They are fixed to each other in the axial direction.

他方外周カム面４０は、リテーナ２０をコネクタ本体１８のリテーナ保持部２６に軸方向に挿入する際、掛止部３２との当接によってリテーナ２０を全体的に且つ弾性的に縮径運動させ、その縮径運動を伴って掛止溝３６を掛止部３２に対し掛止させる。
尚リテーナ２０の先端部には操作つまみ４２が設けられており、この操作つまみ４２に力を加えることによってリテーナ２０を縮径運動させることもできる。 When the retainer 20 is inserted into the retainer holding portion 26 of the connector main body 18 in the axial direction, the outer peripheral cam surface 40 causes the retainer 20 to reduce the diameter of the retainer 20 as a whole and elastically by contact with the latching portion 32. The latching groove 36 is latched to the latching portion 32 along with the diameter reducing motion.
An operation knob 42 is provided at the tip of the retainer 20, and the retainer 20 can be reduced in diameter by applying a force to the operation knob 42.

このコネクタ１６では、リテーナ２０をコネクタ本体１８のリテーナ保持部２６に保持させておき、その状態で相手パイプ１０をリテーナ２０内部に軸方向に挿入する。
このとき、リテーナ２０は相手パイプ１０の係合凸部１２によって拡開方向に弾性的に押し拡げられ、そして係合凸部１２が係合凹部３４に到ったところで縮径運動するとともに、係合凸部１２が係合凹部３４に係合した状態となる。 In this connector 16, the retainer 20 is held by the retainer holding portion 26 of the connector body 18, and the mating pipe 10 is inserted into the retainer 20 in the axial direction in this state.
At this time, the retainer 20 is elastically pushed and expanded in the expanding direction by the engaging convex portion 12 of the mating pipe 10, and when the engaging convex portion 12 reaches the engaging concave portion 34, the retainer 20 performs a diameter reducing motion and The joint protrusion 12 is engaged with the engagement recess 34.

尚、リテーナ２０を予め相手パイプ１０に装着しておいて、その状態で相手パイプ１０をリテーナ２０ごとコネクタ本体１８に挿入するようにしても良い。
このとき、リテーナ２０は一旦縮径運動した後、掛止溝３６が掛止部３２の位置に到ったところで拡開運動し、掛止溝３６が掛止部３２に掛止した状態となる。 The retainer 20 may be attached to the mating pipe 10 in advance, and the mating pipe 10 may be inserted into the connector main body 18 together with the retainer 20 in this state.
At this time, after the retainer 20 has once contracted in diameter, the retainer 20 expands when the latching groove 36 reaches the position of the latching portion 32, and the latching groove 36 is latched to the latching portion 32. .

上記シール部材としてのＯリング２２及びブッシュ２４は、リテーナ保持部２６よりも奥側においてコネクタ本体１８内部に装着保持されており、コネクタ本体１８内に相手パイプ１０が挿入された時点で、Ｏリング２２又はこれらＯリング２２及びブッシュ２４が、相手パイプ１０の挿入端部４４、即ち係合凸部１２よりも先端側の挿入端部４４の外周面に気密に接触して、かかる相手パイプ１０とコネクタ本体１８との間を気密にシールする。   The O-ring 22 and the bush 24 as the sealing member are mounted and held inside the connector main body 18 on the back side of the retainer holding portion 26, and the O-ring is inserted when the mating pipe 10 is inserted into the connector main body 18. 22 or these O-rings 22 and the bush 24 are in airtight contact with the outer peripheral surface of the insertion end 44 of the mating pipe 10, that is, the insertion end 44 on the tip side of the engagement convex portion 12. The space between the connector body 18 is hermetically sealed.

上記圧入部２８は、樹脂チューブ１４の内部に軸方向に圧入される部分であって、その外周面に且つ軸方向の異なった複数箇所に、断面が鋸歯状の先端が鋭角をなす環状突起４６が形成されている。
コネクタ本体１８は、この圧入部２８を樹脂チューブ１４の一端からその内部に圧入することによって、かかる樹脂チューブ１４から抜止めされる。 The press-fitting portion 28 is a portion that is press-fitted in the resin tube 14 in the axial direction, and is provided on the outer peripheral surface of the press-fit portion 28 at a plurality of different locations in the axial direction. Is formed.
The connector body 18 is prevented from being removed from the resin tube 14 by press-fitting the press-fit portion 28 into one end of the resin tube 14.

図１は上記配管部材１３の車体への組付状態を示している。
図示のようにここでは樹脂チューブ１４が、その可撓性に基づいて長手方向の複数箇所（ここでは３箇所）で円弧形状に曲げられており、そしてそれら複数箇所の曲げ部５０‐１，５０‐２，５０‐３のそれぞれの両側の部位が、固定クランプ４８にて保持され、車体に留め付けられている。 FIG. 1 shows an assembled state of the piping member 13 to the vehicle body.
As shown in the figure, here, the resin tube 14 is bent into an arc shape at a plurality of locations (three locations here) in the longitudinal direction based on its flexibility, and the bent portions 50-1 and 50 at the plurality of locations. The portions on both sides of -2 and 50-3 are held by the fixing clamp 48 and fastened to the vehicle body.

これによりコネクタ１６付き樹脂チューブ１４全体に予定された曲り形状が付与され、その状態で樹脂チューブ１４がコネクタ１６において相手パイプ１０と接続状態に車体に組み付けられている。
即ち直管状に成形された樹脂チューブ１４が、固定クランプ４８による保持拘束作用によって、所望の曲り形状で車体に配管され、組み付けられている。 As a result, a predetermined bent shape is imparted to the entire resin tube 14 with the connector 16, and the resin tube 14 is assembled to the vehicle body in a connected state with the mating pipe 10 in the connector 16.
That is, the resin tube 14 formed into a straight tubular shape is piped and assembled to the vehicle body in a desired bent shape by the holding and restraining action by the fixed clamp 48.

図３及び図４に固定クランプ４８の好適な一例が示してある。ここで図３は固定前の状態を、図４は固定後の状態をそれぞれ表している。
図３において固定クランプ４８は弾性を有する樹脂製のもので、全体として環状を成し、周方向所定個所に開口５２を有する略Ｃ字状を成す保持部５４と、固定部５６とを有している。保持部５４は、開口５２の両側に、外側に突出する一対のガイド用くちばし部５３を有している。また固定部５６は、車体側のパネルの固定孔５７への挿入部５９と、パネルを内外両側から挟持する一対の挟持部６１Ａ，６１Ｂを有している。挟持部６１Ａは、固定部５６あるいは挿入部５９の外端部（保持部５４側の端部）から横方向両側（図３中左右両側）に延びるように一体的に形成され、挟持部６１Ｂは、固定部５６あるいは挿入部５９の内端部（保持部５４と反対側の端部）から横方向両側に延びるように一体的に形成されている。挟持部６１Ｂは、横方向それぞれの側で、保持部５４側に傾斜しながら横方向外側に延びる基部６１Ｂ−１と、基部６１Ｂ−１の横方向外端から保持部５４側に傾斜しながら横方向内側に延びる折り返し部６１Ｂ−２と、を一体的に有している。挟持部６１Ａの横方向外端間の距離は、固定孔５７の幅よりも十分大きく、挟持部６１Ｂの横方向外端間の距離（基部６１Ｂ−１の横方向外端間の距離）は、固定孔５７の幅よりも若干大きい。 3 and 4 show a preferred example of the fixed clamp 48. FIG. Here, FIG. 3 shows a state before fixing, and FIG. 4 shows a state after fixing.
In FIG. 3, the fixed clamp 48 is made of an elastic resin, has a ring shape as a whole, and has a substantially C-shaped holding portion 54 having an opening 52 at a predetermined position in the circumferential direction, and a fixing portion 56. ing. The holding portion 54 has a pair of guide beak portions 53 protruding outward on both sides of the opening 52. The fixing portion 56 includes an insertion portion 59 for inserting the panel on the vehicle body side into the fixing hole 57, and a pair of clamping portions 61A and 61B for clamping the panel from both the inside and outside. The sandwiching portion 61A is integrally formed so as to extend from the outer end portion (end portion on the holding portion 54 side) of the fixed portion 56 or the insertion portion 59 to both lateral sides (left and right sides in FIG. 3). These are integrally formed so as to extend from the inner end of the fixing portion 56 or the insertion portion 59 (the end opposite to the holding portion 54) to both sides in the lateral direction. The sandwiching portion 61B has a base portion 61B-1 that extends outward in the lateral direction while tilting toward the holding portion 54 on each side in the lateral direction, and a lateral portion while tilting toward the holding portion 54 from the lateral outer end of the base portion 61B-1. And a folded portion 61B-2 extending inward in the direction. The distance between the lateral outer ends of the clamping part 61A is sufficiently larger than the width of the fixing hole 57, and the distance between the lateral outer ends of the clamping part 61B (the distance between the lateral outer ends of the base part 61B-1) is It is slightly larger than the width of the fixing hole 57.

この固定クランプ４８では、図４に示しているように保持部５４を弾性拡開させながら樹脂チューブ１４を開口部５２を通じて保持部５４内に軸直角方向に挿入して保持部５４により保持させる。また固定クランプ４８を固定孔５７において車体に留め付けることで、樹脂チューブ１４を車体に固定状態とする。固定クランプ４８の留め付けは、例えば、挟持部６１Ｂが横方向内側に変形しながらパネルの固定孔５７内に押し込まれ、そして、固定孔５７からパネルの裏側に通り抜けた状態となるまで、挿入部５９を固定孔５７に挿入することにより、行われる。取り付けられた状態では、挟持部６１Ａの横方向外端部がパネル表面と係合し、挟持部６１Ｂの折り返し部６１Ｂ−２が、固定孔５７の縁又は内端縁と係合している。したがって、例えば、固定クランプ４８は、パネルに安定して取り付けられているが、固定クランプ４８の固定孔５７への挿入はスムーズに行われ、また、固定クランプ４８を固定孔５７から引き抜くことも可能である。   In the fixed clamp 48, the resin tube 14 is inserted into the holding portion 54 through the opening 52 in the direction perpendicular to the axis and held by the holding portion 54 while the holding portion 54 is elastically expanded as shown in FIG. 4. The resin tube 14 is fixed to the vehicle body by fastening the fixing clamp 48 to the vehicle body in the fixing hole 57. The fixing clamp 48 is fastened, for example, until the sandwiching portion 61B is pushed into the fixing hole 57 of the panel while being deformed inward in the lateral direction, and passes through the fixing hole 57 to the back side of the panel. This is done by inserting 59 into the fixing hole 57. In the attached state, the lateral outer end portion of the sandwiching portion 61A is engaged with the panel surface, and the folded portion 61B-2 of the sandwiching portion 61B is engaged with the edge or the inner end edge of the fixing hole 57. Therefore, for example, the fixed clamp 48 is stably attached to the panel, but the fixed clamp 48 can be smoothly inserted into the fixed hole 57, and the fixed clamp 48 can be pulled out from the fixed hole 57. It is.

図５及び図７に示しているように、配管部材１３には車体への組付け前において、両端のコネクタ１６に閉鎖部材６６が装着されている。
閉鎖部材６６は、フランジ部６８とこれに続く大径部７０及びこれよりも小径をなす閉鎖軸部７２を有しており、コネクタ１６への挿入状態で、その閉鎖軸部７２の外周面にＯリング２２又はシール部材としてのＯリング２２及びブッシュ２４が気密に嵌合した状態となって、コネクタ１６における相手パイプ１０との接続用の開口が閉鎖された状態となる。 As shown in FIG. 5 and FIG. 7, the piping member 13 is fitted with the closing members 66 on the connectors 16 at both ends before being assembled to the vehicle body.
The closing member 66 has a flange portion 68, a large diameter portion 70 that follows the flange portion 68, and a closing shaft portion 72 that has a smaller diameter than the flange portion 68, and is inserted into the connector 16 on the outer peripheral surface of the closing shaft portion 72. The O-ring 22 or the O-ring 22 as a seal member and the bush 24 are in a state of being airtightly fitted, and the connection opening with the mating pipe 10 in the connector 16 is closed.

一対のコネクタ１６のそれぞれにはまた、配管部材１３の車体への組付け前の状態において、チェッカー部材（ここでは樹脂材）７４が装着されている。
このチェッカー部材７４は、コネクタ１６と相手パイプ１０とを接続したときにコネクタ１６から外れるようになっており、従ってこのチェッカー部材７４を取り外すことであるいは回収することで、コネクタ１６と相手パイプ１０とが正しく接続されたことを確認することができる。 A checker member (here, a resin material) 74 is attached to each of the pair of connectors 16 in a state before the piping member 13 is assembled to the vehicle body.
The checker member 74 is detached from the connector 16 when the connector 16 and the mating pipe 10 are connected. Therefore, the connector 16 and the mating pipe 10 can be removed by removing or collecting the checker member 74. Can be confirmed to be connected correctly.

図６及び図８に、このチェッカー部材７４の構成が具体的に示してある。
同図に示しているようにチェッカー部材７４は、長手形状をなす基部７６を有しており、その基部７６に円形の取手７８が一体に形成されている。
また基部７６には、取手７８とは反対側に一対の弾性アーム７９が全体として半環状を成すように、それぞれ円弧状に延び出しており、それぞれの端部に掛止爪８０が互いに内向きをなすように一体に形成されている。
これら掛止爪８０は、内端側の前後の面、即ち相手パイプ１０の挿入方向の前後の面が傾斜面８２とされており、また図８に示しているように周方向の一方の面が傾斜面８４とされている。 FIG. 6 and FIG. 8 specifically show the configuration of the checker member 74.
As shown in the figure, the checker member 74 has a base 76 having a longitudinal shape, and a circular handle 78 is formed integrally with the base 76.
In addition, the base 76 has a pair of elastic arms 79 on the opposite side of the handle 78 so as to form a semicircular shape as a whole, and each of the ends extends in an arc shape. It is integrally formed so as to form
These hooking claws 80 have front and rear surfaces on the inner end side, that is, front and rear surfaces in the insertion direction of the mating pipe 10 are inclined surfaces 82, and one surface in the circumferential direction as shown in FIG. Is an inclined surface 84.

基部７６にはまた、その前端部と後端部（図６中左端部と右端部）とに、コネクタ１６における大径のリテーナ保持部２６を前後から挟持する挟持部８６，８８が掛止爪８０の側に一体に形成されている。
ここで一方の挟持部８６には爪９０が形成されている。 In addition, the base portion 76 has hooking claws 86 and 88 for holding the large-diameter retainer holding portion 26 of the connector 16 from the front and rear at the front end portion and the rear end portion (left end portion and right end portion in FIG. 6). It is integrally formed on the 80 side.
Here, a claw 90 is formed on one of the clamping portions 86.

このチェッカー部材７４は次のように働く。
図８は、チェッカー部材７４をコネクタ１６に装着した状態を示している。
このときチェッカー部材７４の一対の掛止爪８０は、コネクタ本体１８における窓部３０内に入り込んで、窓部３０の周方向縁部に係合しており、その係合力によってチェッカー部材７４がコネクタ１６に固定され保持されている。 The checker member 74 works as follows.
FIG. 8 shows a state where the checker member 74 is attached to the connector 16.
At this time, the pair of latching claws 80 of the checker member 74 enter the window 30 in the connector main body 18 and engage with the circumferential edge of the window 30, and the checker member 74 is connected to the connector by the engaging force. 16 is fixed and held.

尚このとき、図７に示しているように一対の挟持部８６，８８はコネクタ本体１８の大径のリテーナ保持部２６を前後即ち軸方向から挟持し、且つ一方の挟持部８６に形成された爪９０が、リテーナ保持部２６の軸端に掛止している。
この状態で相手パイプ１０がコネクタ１６内に挿入されると、図９（Ｉ），（II）に示しているように係合凸部１２と一対の掛止爪８０の傾斜面８２との当接によって、一対の弾性アーム７９が掛止爪８０とともに強制的に拡開せしめられる。図９（III）はこのときの状態を表わしている。 At this time, as shown in FIG. 7, the pair of holding portions 86 and 88 hold the large-diameter retainer holding portion 26 of the connector body 18 in the front-rear direction, that is, in the axial direction, and are formed in one holding portion 86. A claw 90 is hooked on the shaft end of the retainer holding portion 26.
When the mating pipe 10 is inserted into the connector 16 in this state, as shown in FIGS. 9 (I) and (II), the contact between the engagement convex portion 12 and the inclined surfaces 82 of the pair of latching claws 80 is made. By the contact, the pair of elastic arms 79 is forcibly expanded together with the hooking claws 80. FIG. 9 (III) shows the state at this time.

この状態に到ると、掛止爪８０の傾斜面８４が窓部８０の周方向の縁部に掛かった状態となって、そのまま取手７８を手に持って図９中下向きに引っ張ると（図９（IV）参照）、容易にチェッカー部材７４がコネクタ１６から離脱する。
このチェッカー部材７４は、一対の掛止爪８０が丁度リテーナ２０における係合凹部３４の位置（軸方向位置）に位置しており、従ってチェッカー部材７４のコネクタ１６からの離脱は、確実に相手パイプ１０の係合凸部１２がリテーナ２０の係合凹部３４に嵌り合ったことを意味する。
即ち相手部材１０が確実にコネクタ１６に接続されたことを意味する。 When this state is reached, the inclined surface 84 of the latching claw 80 is in a state of being hooked on the circumferential edge of the window portion 80, and if the handle 78 is held in its hand and pulled downward in FIG. 9 (IV)), the checker member 74 is easily detached from the connector 16.
In this checker member 74, the pair of latching claws 80 are located just at the position (axial position) of the engaging recess 34 in the retainer 20, so that the checker member 74 is reliably detached from the connector 16. This means that the ten engaging convex portions 12 are fitted in the engaging concave portions 34 of the retainer 20.
That is, it means that the mating member 10 is securely connected to the connector 16.

樹脂チューブ１４における耐折れ性と、外径ｄと肉厚ｔとの比率ｄ／ｔとの関係を明らかにすべく以下の試験を行った。
ここでは外径ｄをφ４ｍｍで一定とし（比較例Ｎｏ．６を除く）、肉厚ｔを様々に変化させて、それぞれについて樹脂チューブ１４の両端を固定クランプ４８で保持した状態で９０°曲げを行った。
次に固定クランプ４８間の距離を短くして樹脂チューブ１４を保持し、同様にして９０°曲げを行った。 The following tests were conducted to clarify the relationship between the bending resistance of the resin tube 14 and the ratio d / t between the outer diameter d and the wall thickness t.
Here, the outer diameter d is constant at φ4 mm (except for comparative example No. 6), the wall thickness t is changed variously, and the resin tube 14 is bent at 90 ° with both ends held by the fixing clamps 48 for each. went.
Next, the resin tube 14 was held by shortening the distance between the fixed clamps 48, and was bent 90 ° in the same manner.

この作業を樹脂チューブ１４が折れ（座屈，キンク）を起こすまで繰り返し、折れを生じない最少曲げＲ（半径）を求めた。ここでは、曲げＲは外側層の曲げの内側の曲率半径である（図１（Ｂ）の符号Ｒ参照）。
また併せてコネクタ１６の圧入試験を行い、圧入作業性を確認した。
尚圧入は、樹脂チューブ１４の端部を予め拡径した上で行った。 This operation was repeated until the resin tube 14 was bent (buckling, kink), and the minimum bending R (radius) at which no bending occurred was obtained. Here, the bend R is the radius of curvature inside the bend of the outer layer (see symbol R in FIG. 1B).
In addition, a press-fitting test of the connector 16 was performed to confirm the press-fitting workability.
The press-fitting was performed after the end of the resin tube 14 was expanded in advance.

その結果が表１及び図１０に示してある。
表１中No.2〜No.4が本発明の実施例に該当するものであり、No.1，No.5及びNo.6が比較例となるものである。実施例及び比較例は、寸法を除いて樹脂チューブ１４と同じ積層構造をもつ（図５（Ｂ）参照）。実施例及び比較例について、外径ｄは外側層の外径であり、内径は内側層の内径である。 The results are shown in Table 1 and FIG.
In Table 1, No. 2 to No. 4 correspond to the examples of the present invention, and No. 1, No. 5 and No. 6 are comparative examples. The examples and comparative examples have the same laminated structure as the resin tube 14 except for the dimensions (see FIG. 5B). For the examples and comparative examples, the outer diameter d is the outer diameter of the outer layer, and the inner diameter is the inner diameter of the inner layer.

Figure 2006194432
注） 挿入作業性について、○印は、コネクタを樹脂チューブに良好に圧入できることを、×印はコネクタを樹脂チューブに圧入しにくいことを示す。
Figure 2006194432
 Note) Regarding insertion workability, ○ indicates that the connector can be press-fitted well into the resin tube, and x indicates that the connector is difficult to press-fit into the resin tube.

これらの結果から、外径ｄと肉厚ｔとの比率（肉厚比）が小さくなるのに伴なって、表１中の曲げＲが小さくなること、即ち折れ難くなることが分る。
但し肉厚比が余り小さくなると、コネクタ１６の挿入作業性が悪化してしまう。
樹脂チューブ１４の折れに対する抵抗性と挿入作業性とを考えると、肉厚比は４〜８の間が適正であることが表１，図１０の結果から分る。
尚、No.6については肉厚比は４．０〜８．０の条件を満たしているものの、曲げＲが５０と大きな値となっている。即ち非常に折れ（座屈）を生じ易いものとなっている。 From these results, it can be seen that as the ratio (thickness ratio) between the outer diameter d and the wall thickness t becomes smaller, the bending R in Table 1 becomes smaller, that is, it becomes difficult to break.
However, when the thickness ratio is too small, the insertion workability of the connector 16 is deteriorated.
Considering the resistance to bending of the resin tube 14 and the insertion workability, it can be seen from the results of Table 1 and FIG.
For No. 6, the wall thickness ratio satisfies the condition of 4.0 to 8.0, but the bending R is as large as 50. That is, it is very easy to bend (buckling).

これは外径が大きくなった結果、同じ曲げＲであっても即ち同じ曲率半径で曲げても曲げの外周側，内周側において、特に内周側において急激な曲げとなってしまい、また径が大きいことから折れに対する抵抗性が小さくなったことによる結果である。   As a result of the increase in the outer diameter, even if the bend R is the same, that is, the bend with the same radius of curvature, the bend is abruptly bent on the outer peripheral side and inner peripheral side of the bend, particularly on the inner peripheral side. This is due to the fact that the resistance to breakage is reduced due to the large value.

以上のような本実施形態によれば、コネクタ１６によって少ない手間で簡単に相手パイプ１０と配管部材１３とを接続作業することができ、また外径ｄと肉厚ｔとの比率を４〜８の範囲内に抑えることによって、樹脂チューブ１４に曲げ力を加えた場合でも樹脂チューブ１４が折れを生じるのを良好に防止することができ、樹脂チューブ１４を曲げながら車体に配管組付けするに際してその組付作業を容易に行うことができる。   According to the present embodiment as described above, the mating pipe 10 and the piping member 13 can be easily connected with the connector 16 with little effort, and the ratio of the outer diameter d to the wall thickness t is set to 4-8. If the bending force is applied to the resin tube 14, the resin tube 14 can be prevented from being bent even when the resin tube 14 is bent. Assembly work can be easily performed.

また本実施形態に従い、コネクタ１６にチェッカー部材７４を予め装着しておくことで、配管組付時に目視によりコネクタ１６と相手パイプ１０との接続状態を確認する必要がなく、奥まった箇所など見えない箇所で接続を行った場合においてもチェッカー部材７４を取り外すことによりあるいは回収することで、容易に接続の確認を行うことができる。   In addition, according to the present embodiment, by attaching the checker member 74 to the connector 16 in advance, it is not necessary to visually check the connection state between the connector 16 and the mating pipe 10 when assembling the pipe, and the recessed portion cannot be seen. Even when connection is made at a location, the connection can be easily confirmed by removing or collecting the checker member 74.

更にコネクタ１６に相手パイプ１０との接続前において、その接続用の開口を閉鎖する閉鎖部材６６を装備しておくことで、コネクタ１６を通じ樹脂チューブ１４内部にごみその他の異物が入り込むのを良好に防止することができる。
また両端部のコネクタ１６の一方の閉鎖部材６６を取り外し、他方にだけ閉鎖部材６６を残しておくことで、一方の側から樹脂チューブ１４内部に圧力を加えて樹脂チューブ１４とコネクタ１６との接続部分における漏れの有無を簡単に確認することができる。 Further, by providing the connector 16 with a closing member 66 for closing the connection opening before connecting to the mating pipe 10, dust and other foreign matters can be satisfactorily introduced into the resin tube 14 through the connector 16. Can be prevented.
Further, by removing one closing member 66 of the connector 16 at both ends and leaving the closing member 66 only on the other side, pressure is applied to the inside of the resin tube 14 from one side to connect the resin tube 14 and the connector 16. The presence or absence of leakage in the portion can be easily confirmed.

更に本実施形態の配管部材１３の樹脂チューブ１４は外径が６ｍｍ以下の細径チューブであり、フューエルリターンレスシステムの配管用として用いた場合において、燃料の送りの流速が遅くならず、従って樹脂チューブ１４内部で燃料流体の温度上昇を抑制することができて、かかるフューエルリターンレスシステムの配管用として好適に用いることができる。   Further, the resin tube 14 of the piping member 13 of the present embodiment is a thin tube having an outer diameter of 6 mm or less, and when used for piping of a fuel returnless system, the flow rate of the fuel is not slowed. The temperature rise of the fuel fluid can be suppressed inside the tube 14 and can be suitably used for piping of such a fuel returnless system.

また、径方向に弾性変形可能なリテーナを有するものであれば、リテーナがコネクタ本体と別体であっても一体的に形成されていても、樹脂チューブ１４の両端部（又は片方端部）に装着されるコネクタとして用いることができる。本発明の実施の形態で用いられるコネクタのリテーナは、相手パイプ１０がコネクタ本体内に挿入されると、相手パイプ１０の係合凸部１２に押されて、一旦径方向に変形（例えば径方向に広がる変形）してから弾性復帰し、相手パイプ１０の係合凸部１２と係合してコネクタ本体を軸方向に固定するものである。例えば、図１４に示されるコネクタ３００のように、リテーナ保持部３０４内にリテーナ３０２が組み込まれて一体化したものを適用することができる。あるいは図１７に示されるコネクタ４００のように、相手パイプ２０２又は１０を完全に挿入したときに、リテーナ４０２がリテーナ保持部４０４に対して押し込むことができるようになるといったものも適用することができる。なお、コネクタ３００やコネクタ４００を用いる場合には、接続部３１２や接続部４１４を、樹脂チューブ１４と適切に接続できる樹脂チューブ接続部（例えば、圧入部）として構成する。   Moreover, if it has a retainer that can be elastically deformed in the radial direction, even if the retainer is separate from the connector main body or formed integrally, both ends (or one end) of the resin tube 14 are used. It can be used as a connector to be attached. When the mating pipe 10 is inserted into the connector main body, the connector retainer used in the embodiment of the present invention is pushed by the engagement convex portion 12 of the mating pipe 10 and is once deformed in the radial direction (for example, the radial direction). And then elastically recovers and engages with the engaging convex portion 12 of the mating pipe 10 to fix the connector body in the axial direction. For example, like the connector 300 shown in FIG. 14, the retainer 302 incorporated in the retainer holding portion 304 and integrated can be applied. Alternatively, as shown in the connector 400 shown in FIG. 17, the retainer 402 can be pushed into the retainer holding portion 404 when the mating pipe 202 or 10 is completely inserted. . When the connector 300 or the connector 400 is used, the connection portion 312 or the connection portion 414 is configured as a resin tube connection portion (for example, a press-fit portion) that can be appropriately connected to the resin tube 14.

以上本発明の実施形態を詳述したがこれはあくまで一例示であり、本発明はその趣旨を逸脱しない範囲において種々変更を加えた形態で構成可能である。   Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

本発明の一実施形態である配管部材を車体への組付状態で表した図である。It is the figure which represented the piping member which is one Embodiment of this invention in the assembly | attachment state to the vehicle body. （Ａ）同実施形態におけるコネクタを一部分解して示す断面図である。（Ｂ）同コネクタを用いて配管部材を相手パイプに接続した状態を示す断面図である。(A) It is sectional drawing which decomposes | disassembles and shows the connector in the embodiment partially. (B) It is sectional drawing which shows the state which connected the piping member to the other party pipe using the connector. 同実施形態における固定クランプの図である。It is a figure of the fixed clamp in the embodiment. 同固定クランプで樹脂チューブを留めた状態を表す斜視図及び断面図である。It is the perspective view and sectional drawing showing the state which fastened the resin tube with the fixed clamp. 同実施形態の配管部材を組付け前の状態で示す図である。It is a figure which shows the piping member of the embodiment in the state before an assembly | attachment. 図５の要部を分解して示す斜視図である。It is a perspective view which decomposes | disassembles and shows the principal part of FIG. 図５の要部の断面図である。It is sectional drawing of the principal part of FIG. 図７のア−ア断面図である。FIG. 8 is a cross-sectional view taken along the line A in FIG. 7. 同実施形態の作用の説明図である。It is explanatory drawing of an effect | action of the embodiment. 本発明の実施例における樹脂チューブの曲げＲと肉厚比との関係を示す図である。It is a figure which shows the relationship between the bending R and thickness ratio of the resin tube in the Example of this invention. コネクタを用いた配管部材の従来の接続例を示す図である。It is a figure which shows the example of the conventional connection of the piping member using a connector. 図１１におけるコネクタの要部を樹脂チューブとともに示す図である。It is a figure which shows the principal part of the connector in FIG. 11 with the resin tube. フューエルリターンシステムの概念図である。It is a conceptual diagram of a fuel return system. 別のコネクタを示す図である。It is a figure which shows another connector. 別のコネクタと相手パイプとの接続状態を示す図である。It is a figure which shows the connection state of another connector and an other party pipe. 別のコネクタの変形例を示す図である。It is a figure which shows the modification of another connector. さらに別のコネクタを示す分解斜視図である。It is a disassembled perspective view which shows another connector. さらに別のコネクタを示す断面図である。It is sectional drawing which shows another connector.

符号の説明Explanation of symbols

１０ 相手パイプ
１３ 配管部材
１４ 樹脂チューブ
１６ コネクタ
１８ コネクタ本体
２０ リテーナ
２２ Ｏリング
２６ リテーナ保持部
３２ 掛止部
３４ 係合凹部
３８ 内周カム面
４０ 外周カム面
６６ 閉鎖部材
７４ チェッカー部材
DESCRIPTION OF SYMBOLS 10 Counter pipe 13 Piping member 14 Resin tube 16 Connector 18 Connector main body 20 Retainer 22 O-ring 26 Retainer holding | maintenance part 32 Latching part 34 Engagement recessed part 38 Inner peripheral cam surface 40 Outer peripheral cam surface 66 Closing member 74 Checker member

Claims (8)

エンジンと燃料タンクとの間に配管されて燃料を輸送する配管部材であって、
（Ａ）該配管部材の主要素を成す樹脂チューブと、（Ｂ）該樹脂チューブの端部に装着された、相手パイプとの接続用のコネクタとを有しており、該コネクタは、（ａ）軸方向の一方側にリテーナ保持部を、他方側に前記樹脂チューブとの接続部を供えたコネクタ本体と、（ｂ）該リテーナ保持部にて保持され、前記相手パイプと係合して軸方向に固定するリテーナと、（ｃ）該相手パイプの外周面に気密に接触してシール作用を成すシール部材と、を有しており、
前記樹脂チューブは、内側の燃料バリア層と外側のＰＡ層との積層構造を有していて、更にその外周面が保護層にて被覆されており、且つ該保護層を除いたチューブ外径が６ｍｍ以下の細径チューブであって、該チューブの外径ｄと肉厚ｔの比率ｄ／ｔが４〜８となしてあることを特徴とする燃料輸送用の配管部材。 A piping member that is piped between an engine and a fuel tank to transport fuel,
(A) It has a resin tube which constitutes the main element of the piping member, and (B) a connector for connection to a mating pipe attached to the end of the resin tube. ) A connector body provided with a retainer holding portion on one side in the axial direction and a connecting portion with the resin tube on the other side; and (b) a shaft that is held by the retainer holding portion and engages with the mating pipe. A retainer that is fixed in a direction, and (c) a seal member that is in airtight contact with the outer peripheral surface of the mating pipe and performs a sealing action.
The resin tube has a laminated structure of an inner fuel barrier layer and an outer PA layer, the outer peripheral surface thereof is covered with a protective layer, and the outer diameter of the tube excluding the protective layer is A pipe member for transporting fuel, characterized in that the tube has a diameter of 6 mm or less, and the ratio d / t of the outer diameter d to the wall thickness t of the tube is 4-8. 請求項１において、前記リテーナ保持部はソケット状に形成されていることを特徴とする燃料輸送用の配管部材。   2. The piping member for fuel transportation according to claim 1, wherein the retainer holding portion is formed in a socket shape. 請求項１又は２において、前記燃料バリア層がＥＴＦＥであることを特徴とする燃料輸送用の配管部材。   3. The piping member for fuel transportation according to claim 1, wherein the fuel barrier layer is ETFE. 請求項１又は２において、前記燃料バリア層の主成分がＥＴＦＥ，ＴＰＥＥ，ＰＢＴ，ＰＢＮ，ＰＰＳ，ＰＥ，ＰＰ，ＰＶＤＦ，ＥＶＯＨの何れかであることを特徴とする燃料輸送用の配管部材。   3. The piping member for fuel transportation according to claim 1, wherein a main component of the fuel barrier layer is any one of ETFE, TPEE, PBT, PBN, PPS, PE, PP, PVDF, and EVOH. 請求項１〜４の何れかにおいて、前記樹脂チューブの両端部が前記コネクタに対して圧入又は溶着により接続されていることを特徴とする燃料輸送用の配管部材。   5. The piping member for fuel transportation according to claim 1, wherein both ends of the resin tube are connected to the connector by press-fitting or welding. 請求項１〜５の何れかにおいて、前記コネクタには前記相手パイプと該コネクタとを接続したときに該コネクタから外れるチェッカー部材が装着されていることを特徴とする燃料輸送用の配管部材。   6. The fuel transport piping member according to claim 1, wherein a checker member that is detached from the connector when the mating pipe is connected to the connector is attached to the connector. 請求項１〜６の何れかにおいて、前記コネクタには前記相手パイプとの接続前において接続用の開口を閉鎖する閉鎖部材が装着されていることを特徴とする燃料輸送用の配管部材。   7. The fuel transport piping member according to claim 1, wherein a closing member that closes a connection opening is attached to the connector before connection to the mating pipe. 請求項１〜７の何れかにおいて、前記配管部材が前記燃料タンクから該エンジンのインジェクタに燃料供給する一方、該インジェクタから該燃料タンクへの燃料の戻しを行わないフューエルリターンレスシステムの配管用として用いられるものであることを特徴とする燃料輸送用の配管部材。
8. The fuel return-less system according to claim 1, wherein the piping member supplies fuel from the fuel tank to the injector of the engine, but does not return fuel from the injector to the fuel tank. A piping member for fuel transportation, which is used.
JP2005342038A 2004-12-17 2005-11-28 Piping member for transporting fuel Pending JP2006194432A (en)

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